Testing machine



July 25, 1933. c. B. THwlNG TESTING MACHINE Filed July 16, 1929 4Sheets-Sheet l (Y YI wenzff Cczras y sforlzeys Mm vllliTllJdl W g mmN MT1 ,I ULF m @I mum. MJ L QM July 25, 1933. Q B THW|NG l 1,920,039

TESTING MACHINE F'iled July 16, 1929 4 Sheets-Sheet 2 July z5, 1933. C,a THWING 1,920,039

TESTING MACHINE Filed July 16, 1929 4 Sheets-Sheet 3 C. B. THWINGTESTING MACHINE July 25, 1933.

Filed July 16, 1929 4 Sheets-Sheet 4 Patented July 25, 1933 UNITEDSTATES CHARLES BL THW'ING, 0]? PHILADELPHIA,

PEPNNSYLVANIA, ASSIGNOR T THWING INSTRUMENT COMPANY, OF PHILADELPHIA,PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA TFS'IING MACHINE Applicationfiled July 16,

This invention relates to testing machines and more particularly to anapparatus for` testing the efficiency of gummed tape.

Gummed tapes vary considerably in their practical value due tovariationin the quality of the glues employed thereon. An importantfeature in ,determining `the lquality of glue when employed ongummedftapes is its resistance to slippage after being moistened andapplied to paper or fabric and before it is completely dried. Aneflicient tape. should have practically instantaneous adhesion, and animportant object of this invention is the production vof a practicallyusable apparatus for testing such tapes for their adhesive strength at adei'inite period after moistening and application.

A further object of the invention is to provide an apparatus of thischaracter whichY may be ruggedly constructed so that it is notsusceptible to errors` occurring through wear upon the several parts andwhich at the same time is sufficiently delicate that an accuratedetermination of the adhesive qualities of the glue employed may besecured.

A still further object of the invention is to provide an apparatus ofthis character in which the tests may be readily made by any person. Y A

These and other objects` Iattain by the construction vshown in theaccompanying drawings wherein, for the purpose ofillus tration, I haveshown a 'preferred embodiment of my invention and wherein:

Fig. l is a side elevation of Val testing inachine constructed inaccordance with my invention Fig. 2 is a plan view thereof;

Fig. 3 isa section on line 3-3 of Fig. l;

Fig. 4 is a section on linea-4 of Fig. 3;

and l y Fig. 5 is a section online 5f-5 of Fig. 1. Referring now morevparticularly to the drawings, the numeral orenerally designates asuitable base fromw iich arise stand ards 11. These standards, whichareV rela- .mounts a gudgeon 13-a coaxial vwith the shaft and forming abearing for acollar 18.

1929. Serial No. 378,690.

This collar carries a pointer 19 and has serves both as acounter-balance for the pointer and as a means for rotatably shiftingthe same.

Secured `to shaft 13 betweenV the standf ards is a crank arm 23 having`a projecting pin 24 arranged in the path. of pointer 19.

VvMounted in standards 11 adjacent one side thereof is a roclr shaft 25mounting a latch nose-26 for engagement with the latch lug 17 of thependulum arm. rlhe latch lug is preferably disposed at one end of alever 27 secured to the vshaft 25, the opposite end of the leverco-acting with a stop 28, which is hereinafter more fully disclosed,provides a bearing for another portion of the apparatus.

The outer end of shaft 25 is provided with Y an operating handle 29 andhas associated therewith a spring 30 constantly urging rotation of theshafjt ina direction to engage the lever with stop 28 and so to positionthe latch nose for engagement with the lug of the pendulum arm. Y Y

Base :10- is provided with a' pointer 31 which by correlation with index32 carried by the pendulum may be'elnployed to. determine the properleveling of the base.

. Stop 28is in the form of a `transversely r extending shaft connectingthe upper ends of standards 11 adjacent one side thereof, and there is acorresponding shaft 28-a. connecting the standards at the opposite sidethereof. Upon these shafts tilting tables 33 are-pivoted throughapertured ears 34C. Each table 33 has at its inner .end a dependingroller bearing arm 35 the, rollers 3G of which have 'their' axesvertically aligned with the Vaxis ofshaft 13. The inner ends `of thesetables are. counter weighted as at 37 in' order to maintain rollers 36in engagement with cam 14 with which theyalign. ,Upon the uppersurfaces, of each table is mounted a clamping lever 38 the inner end ofwhich has pivotally connected thereto a clamping head 39 adapted tocooperate with the upper surface of the Sui 2 j l. v1,920,039.

table to clamp'jaslieet thereto, and the outer end of which has`directedL therethrough an adjusting screw l0 engaging the upper surffaceof table 33 to urgetlie clamping head toward the tableagainst theinfluence` of a springtl. j Y* Y l i In use of the apparatus a'pair-ofsheets S57 heads 39 and the table, and adjacent-edges of these sheetsare connectedby `thegummed tape T? which is to be tested. A shortspaceof time is allowed to elapse tov permit the glue to partially set,after jwhich thev time levei- 29 is operated to releasependulum l5.Pendulum 15 as itswings. downwardly rotates shaft land through thisshaft cam `14 and crank arm 23. Cain 14; acting upon rollers 3G Vurgesadjacent edges of the `tables 33 lupwardly and accordingly increases thedistance` between adjacent edges of the sheets Sl" applied thereto4thereby applying a pullagainst the sheets S and upon the tape T whichis being rtested. At the sanietime rotation efk the shaft is imparted tothe pointer through pin Qt bringing this pointer into cooperativerelationV with 'a dial42; It will be noted that the pendulum Will actupon the tables with a constantly decreasingyforce so that the adhesiveresistance will finally overconie'the force applied by the pendulumthereby checking the movement thereof. Return movement of the'penduluinwithdraws the pin 24 from the pointer vwith the result that `the pointerwhich .is frictioiially held against rotation will remain at the pointof'y its furthest advance and retain record thereof.

' It will be obvious that apparatus of 4this character may be verylsimply `v operated and will provide an accurate andreadilf ae# quiredtestV for' determining the relative qualities of various gummed tapesgfIt willV also be obvious that theconstruction einvployed is capable ofconsiderable range `of change and modificationwithout departing from theYspirit of myinventi-o'n; v I accordinglyido not Vlimit myself to "suchspecilie structure except as hereinafter claimed.

-Iclaimz L1.1In a testing machine of the character described,opposednormally aligned tables mounted for tilting movement, means forkclainpingto said tables members the `adjacent edges ofwhich areconnected by a gummed,v

tape, V and means-'for oppositelytilting the tables to causeseparationofvsaid clamping vmeansk and thereby;1 place afstrain` .upon the:adhesiveconnection between thetape and said members comprising apendulumoperated cam and meanson the tables at adj acent' edgestliereof'operatively engaging said cam.

2. 'In a y testing machine, opposed tables,

are clamped between the clamping;

'means mounting said tables for pivotal movementi about aresVparalleliiig y adjacent edges thereof, means for clamping to said,tables the outer edges of members adjacent edgesof which arevadliesively connected by ajguinmed tapeand means operatively Vcoactingwith adjacent edges 4ot Said tables for `sively connected by a guminedtape, Vcam means underlying adjacent j edges of said tables,- ineans onthetables operatively en gagiiigthe cani'ineans tocause tiltingof thevtablesin a direction separating the clamp-` i j ing Vmeans uponmovement ofV said cam means, means forsupplying a constantly decreasingforce to rotate said cani means, andi meansV for indicating the extentof rotation of thegjcain means. y

Y 4. InV atesting machine, opposed standiards,`spaced pivots carried bythe standards,

opposed tables mounted upon the .pivots at points spaced ifromadjacent'edges thereof,

clamping means on each table, a shaft inouiitedin the vstandardsVand''underlying adjacentedges ofthe tables, a cain carried Vby theshaft, means on adjacent edges of the tables operatively engaging thecam to cause tilting of the tables in a direction separating -tlieclampingineansupon movement of said cam means, a pendulum secured to theshaft, and means for registerii'ig movement of the pendulum in onedirection.

5. Aldevice as claimed iiielaim 4 wherein the means onthe tablesoperatively engaging vthe cam comprises rollers carried by adjacentedges of the tables.

6. In a` testing machine, opposed tables mounted on pivots spaced fromadjacent edgestliereof, clamping means on each table, a vpendulum shaftextending beneath adja cent edges of thetables, cam means operated bysaid pendulum shaft, means on adjacent edges of the tables operativelyengaging the cam means whereby to case tilting` of the tables in ladirection separating the clamping means When' theshaftis rotated in onedirection, la' pendulum secured to saidshaft to rotate the shaftin saiddirection, and means forindicating theextent through'whieh the pendulummoves.

7 device as claimed Vin claim 6 whereinl the cam Vmeans Vcomprises a camdirectly mountedV on the pendulum' shaft andthe means on the tablescomprises rollers directly engagiiigsaid cam. t

j j a cHARLns B. riiwiNe.

